X xx- - antid antidazzle device



ug- 29, 1933. E. wALMsLEY Er AL ANTIDAZZLE DEVICE Filed April 18. 1931H601 'D Us Y Patented Aug. y29, :193,3

p n l 1,924,338L- s l YANrnnizzLE DEVICE v Edgar Walmsley and HenryAltrec! Francis,

' BlaolrpooLEngland Application April 18, 1931, Serial No. 531,192, and

. in Great Eritain April 25, 1930 "olaimsl (cierto- 4.14)

This invention relates to anti-dazzle devices for application tovehicle'lamps to prevent daze zling the eyes of the drivers of oncomingvehicles, and refers more particularly to thatclass offsuch oi light todiffuse or refract the'light rays. N'Ifhe' primary object of the presentinvention is to" provide an improved Yconstruction or" antidazzle'deviceof the above class which will more e'iectively prevent dazzle and'diiusethe concentratedV glare from the reiiector of the vehicle lamp, but'withwhich a relatively long driving beaniofflight can be obtaineddirectedonjto the surface of the road. s s

With this object in view our invention comprises Vthe following featuresof construction and position of the antidazzle member as will be here--inafter described with reference to the accompanying drawing within.V

Referring to the drawingz- Figure 1 is a perspective View 'illustratingone embodiment of our invention.

Figure 2 is a vertical section of same larged scale.

` Figure 3 is a rear .elevation of same partially broken away.

Figure 4 is a section showing the constructionY of the light diffusingmember. 1,

In the constructions illustrated a light lter adapted for use with avehicle lamp comprisestwo discs 14 and 15 of transparent or translucentmaterial such as for instance Celluloid` or glass, the discs beingspaced apart by means of spacing rings 16 at their peripheries andadditional spac-l Y ing rings 1'7 and 18 disposedvsomewhatnearer theircentres.

The space intermediate the discs14 and 15 and between the rings 16 and1'7 is packed with light'.

refracting and diffusing material 1'9 whilst the space enclosed by thering 18` between the discs 14 and 15 is similarly provided with alling20. The layer of material 20 is preferably somewhat finer and moreclosely packed than the outer layer 19. l

Between the rings ll and 18 is a clearrtrans' -parent portion 21 throughwhich light' can pass easily and give a good driving beam, this clearportion being however coveredat its lower portion in a mannerhereinafter described to prevent the free passage of light therethrough.Y The disc 15 is provided with a rearwardly-pro,-

jecting conical member 22 which is conveniently,

formed from celluloid or glass and which is secured to the rear of thedisc 15 at 23 by means of amyl acetate or other suitable adhesive.

to an en-` VThe `member 22 is disposed substantially centrally or thedevice and when the light iilter is in position in the lamp casing themember 22 profjects towards the electric bulb of the lamp. which includea disc of translucent material which '5 is adapted tobe mounted in frontoi the source The member 22 isfprevided with a light diffusing coating24 joi light refracting or diffusing material, this coating 24 beingdisposed upon the exterior of the inernberjZZ andsecured thereon bymeans of amyl acetate or other suitable adhesive.

The broken glass or like coating also extends over the lower part of theclear portion 21'and beneath the part 22 as 'shown at 25 to preventdazzie `from the lower rpartei' the reflector, the part' 25being ofsubstantially sector shape.

The discs i4 and 15 in this construction have a smooth exterior surfaceand the discs, rings, Vand light difiusing'material are all securedtogether by means of amyl acetate or other suitable adhesive;

' A ring of colouredrcelluloid or otherrmaterial 26 is placed betweenthe discs 14 and 15.

Y Either thesupportingsheets or the lightdiiusing'materialVor-both mayif desiredbecoloured in any suitable manner Vvto suit any particularpurpose for which the medium is proposed to 'be used, or toprovide anyparticular driving light. y i

t is found in actual practice that Ya light lter constructed inaccrodance With'any ,ofY the forms describedl is'oi Vconsiderable usewhenemplcyed inconjunction with illuminated vsignsand when appliedrtovehicle lamps forms an eiective means to prevent dazzlingk the eyes ofthe drivers of othervehicles p Y What we claim-'then is:- 1.`An'anti-.dazzle device for Vehicle lamps comg pris'ing alightdiffusingdisc having an annular light diffusing portion and a central transparentportion, a vtranslucent `member of conical form secured to the'idis'c'toprotect the transparent portion against direct rays of light fromv thelamp, the lightdi'flusingportion of the'disc comprising a layerofparticles of broken glass havingV a large :number of facets, a sheet oftransparent material ons one side of said layer, a further.. sheet oftransparent materialen the other side v .or said layer soV that thelayer is enclosed betweensaid sheets, and an adhesive cementing agentfor uniting said sheets. I

2. An antifdazzle device for Vehicle lamps cornprising alight diiusingdisc having an annular `light `diiusing portionand a central transparentportion, a translucent member secured to the disc to protectjthetransparent portion against direct rays of light from thelampsaidtranslucent; member being of hollow part conical form,` the lightdiffusing portion of the disc comprising a layer of particles of brokenglass having a large number of facets, a sheet of transparent materialon one side of said layer, a further sheet of transparent material onthe other side of said layer so that the layer is enclosed between saidsheets, and an adhesive cementing agent for uniting said sheets.

3. An anti-dazzle device for vehicle lamps comprising a light diffusingdisc having an annular light diffusing portion and a central transparentportion, a translucent member secured to the disc to protect thetransparent portion against direct rays of light from the lamp, saidtranslucent member being of part conical form with the end of smallerdiameter adjacent the disc, the light diiusing portion of the disccomprising a layer of particles of broken glass having a large number offacets, a sheet of transparent material on one side of said layer, afurther sheet of transparent material on the other side of said layer sothat the layer is enclosed between said sheets, and an adhesivecementing agent for uniting said sheets,

4. An anti-dazzle device for vehicle lamps comprising a light diiusingdisc having an annular light diiusing portion and a central transparentportion, a translucent member secured to the disc to protect thetransparent portion against direct rays of light from the lamp, saidtranslucent member comprising a part conical member of transparentmaterial, a layer of granulated light diiusing material and means forattaching said granulated material to said part conical member, thelight diffusing portion of said disc comprising a layer of granulatedlight diiusing material, a sheet of transparent material on one side ofsaid layer, and a further sheet of transparent material on the otherside of said layer so that the layer is enclosed between said sheets.

5. An anti-dazzle device for vehicle lamps comprising a light diffusingdisc having an annular light diffusing portion and a central transparentportion, a translucent member secured to the disc to protect thetransparent portion against direct rays of light from the lamp, saidtranslucent member comprising a hollow part conical member of glass, alayer of particles of broken glass and means for attaching said brokenglass to said part conical member, the light diiusing portion of saiddisc comprising a layer of granulated light diiusing material, a sheetof transparent material on one side of said layer, and a further sheetof transparent material on the other side of said layer so that thelayer is enclosed between said sheets.

6. An anti-dazzle device for Vehicle lamps comprising a light diffusingdisc having an annular light diffusing portion and a central transparentportion, a translucent member secured to the discrto protect thetransparent portion against direct rays of light from the lamp, saidtranslucent member comprising a hollow part conical member of glass, alayer of particles of broken glass and means for attaching said brokenglass to said part conical member, the light diffusing portion of saiddisc comprising a layer of granulated light diifusing material, a sheetof transparent material on one side of said layer, a further sheet oftransparent material on the other side of said layer so that the layeris enclosed between said sheets, and means for connecting saidtranslucent member to the disc with the end of smaller diameter adjacentto disc.

EDGAR WALMSLEY. HENRY ALFRED FRANCIS.

